#include a_samp

public OnPlayerDeath(playerid, killerid, reason)
{
    for(new i; i < MAX_PLAYERS; ++i) SetPlayerMarkerForPlayer(playerid, i, (GetPlayerColor(playerid) & 0xFFFFFF00));
    return 1;
}

public OnPlayerSpawn(playerid)
{
    for(new i; i < MAX_PLAYERS; ++i) SetPlayerMarkerForPlayer(playerid, i, GetPlayerColor(playerid));
}

// Make player 42 see player 1 as a red marker
SetPlayerMarkerForPlayer( 42, 1, 0xFF0000FF );
 
// Make the players marker an invisible white (chat will be white but marker will be gone).
SetPlayerMarkerForPlayer( 42, 1, 0xFFFFFF00 );
 
// Make the players marker invisible to the player while keeping chat colour the same. Will only work correctly if SetPlayerColor has been used:
SetPlayerMarkerForPlayer( 42, 1, ( GetPlayerColor( 1 ) & 0xFFFFFF00 ) );
 
// Make the players marker fully opaque (solid) to the player while keeping chat colour the same. Will only work correctly if SetPlayerColor has been used:
SetPlayerMarkerForPlayer( 42, 1, ( GetPlayerColor( 1 ) | 0x000000FF ) );